25040621 has 2 divisors, whose sum is σ = 25040622. Its totient is φ = 25040620.

The previous prime is 25040599. The next prime is 25040681. The reversal of 25040621 is 12604052.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24255625 + 784996 = 4925^2 + 886^2 .

It is a cyclic number.

It is not a de Polignac number, because 25040621 - 2⁶ = 25040557 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 25040593 and 25040602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25040681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12520310 + 12520311.

It is an arithmetic number, because the mean of its divisors is an integer number (12520311).

Almost surely, 2^25040621 is an apocalyptic number.

It is an amenable number.

25040621 is a deficient number, since it is larger than the sum of its proper divisors (1).

25040621 is an equidigital number, since it uses as much as digits as its factorization.

25040621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 25040621 is about 5004.0604512735. The cubic root of 25040621 is about 292.5600568234.

Adding to 25040621 its reverse (12604052), we get a palindrome (37644673).

The spelling of 25040621 in words is "twenty-five million, forty thousand, six hundred twenty-one".